Stackable clamp



FIG. 1 is a top front perspective view of a stackable clamp showing our new design;

FIG. 2 is a top rear perspective view thereof;

FIG. 3 is a bottom front perspective view thereof;

FIG. 4 is a bottom rear perspective view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a front view thereof;

FIG. 8 is a rear view thereof;

FIG. 9 is a top view thereof; and,

FIG. 10 is a bottom view thereof.

The broken lines in FIG. 9 depict portions of the clamp that form no part of the claimed design. 

The ornamental design for a stackable clamp, as shown and described. 